Question: When was the population of Western Australia 2.5656 million?
Paraphrase: What year was the population of Western Australia 2.5656 million?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q3206 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '2.5656e+06')) . ?s pq:P585 ?value}